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Old 04-21-2022, 04:53 PM   #181 (permalink)
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Originally Posted by aerohead View Post
Thanks! That's helpful.
1) The VG on the mirror is for acoustics. Noise showed up the aero-acoustic wind tunnel and the aerodynamic engineers were able to shift the resonant frequency of the mirror unit by adding the VG ( a very cheap modification to the tooling ) to kill off the offensive noise source.
2) Wheel covers won't be improved upon at any cost.
3) the forwards portion of the belly looks good up to the rear wheel region, then is compromised on account of the exhaust, heat, and carbon-monoxide.
4) Additional heat-shields could be placed strategically.
5) Fiberglass racing exhaust wrap could solve some heat flux issues.
6) Sheet aluminum would be a natural for this area.
7) The 'diffuser' isn't a 'diffuser'. It's just styling.
8) A 'real diffuser should follow where the bottom of quarter-panels project. If it can be worked out around the muffler issue.
9) Aerodynamically, with any tail extension, only the portion of the taillights, up to their burst-edges, would remain visible.
10) The existing rear spoiler would remain in place, just as it is.
11) A new tail upper would integrate to the spoiler's trailing edges.
12) New side extensions would integrate to the existing burst edges .The rear DOES have some existing boat-tailing, so you'd take advantage of that, and add to it, respecting the same contour as you have on the roof, if you can. No more. No less.
13) New diffuser would rise and extend along the path already established by the bottom of the rear quarter panels.
14) New taillights would have to be added, along with relocation of the license plate.
15) If you could relocate the backup camera, and extend the harness, you could maintain that function.
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so whats the best way to go about creating a smooth and angled up rear diffuser? id need some clearance and something heat resistant to get around that muffler

hypothetically guessing, what would my CD drop down to by removing the side mirrors, adding rear wheel skirts, and smoothing out the underside and having a rear diffuser? no upper spoiler or boat tailing done

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Old 04-21-2022, 04:55 PM   #182 (permalink)
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Quote:
hypothetically guessing..
....leads to push-back from the testing rules contingent. They're not wrong.

Here's my example:



The hollow bulkhead represents the extent of the stock body at 100% truncation*. The solid bulhead is where I wanted an upright stack on a 4 into 1 header. Perforated, inside a concave stainless steel deflector.

To accelerate the wake away from the body to the tune of 1500 cubic feet/minute.

*Would deprove the engine cooling.
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Old 04-21-2022, 05:25 PM   #183 (permalink)
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diffuser etc.

Quote:
Originally Posted by Phase View Post
so whats the best way to go about creating a smooth and angled up rear diffuser? id need some clearance and something heat resistant to get around that muffler

hypothetically guessing, what would my CD drop down to by removing the side mirrors, adding rear wheel skirts, and smoothing out the underside and having a rear diffuser? no upper spoiler or boat tailing done
1) First, you need to scout out opportunities for attachment points.
2) The fuel tank needs to be 'fire-walled' away from exhaust heat.
3) Metallic heat shields can be fabricated and attached to the hidden side of belly panels.
4) The exhaust pipe itself wrapped in fiberglass racing wrap.
5) The lower A-arms of the rear suspension may be able to carry their own belly panels.
6) Everything which doesn't 'move' can have a frame structure attached below, from which the skins are secured. This will also define the upsweep of the diffuser section.
7) Aluminum, directly under the muffler would be immune to its heat.
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8) A dual mirror delete would be in the neighborhood of delta Cd 0.0125
9) Rear skirts netted Covington Univ. delta-Cd 0.0063 ( 2.1% ), perhaps an okay working number.
10) The rear belly section with slow diffuser (2.8-degree) was delta-Cd 0.02 ( Audi & FIAT ) if memory serves me.
If so, we're looking @ an est. Cd 0.2012.
If we were millionaires we could actually know.
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Old 04-21-2022, 05:30 PM   #184 (permalink)
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Quoth DDG
Quote:
Basalt Tapes | Exhaust Wrap | Davlyn Group
https://www.davlyngroup.com › products › basalt-tapes
Our basalt tapes provide enhanced heat resistance, high thermal performance, and impressive durability. Basalt tape is a more durable material than fiberglass or carbon fiber tape and works as an excellent heat shield at continuous operating temperatures of 1382F (750C).

High Temperature Insulation Basalt Exhaust Tape Manufacturers
https://www.bstbraidedsleeve.com › high-temperature-insulation-basalt-exhaust-tape_p115.html
High Temperature Insulation Basalt Exhaust Tape is constructed from high quality basalt fibres woven into tape. Recommended for a continuous operating temperature of 750C, Basalt Tape provides an excellent heat shield. When applied as an exhaust heat wrap, the tape provides thermal insulation and radiant heat protection.
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Old 04-21-2022, 11:48 PM   #185 (permalink)
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Quote:
Originally Posted by aerohead View Post
1) First, you need to scout out opportunities for attachment points.
2) The fuel tank needs to be 'fire-walled' away from exhaust heat.
3) Metallic heat shields can be fabricated and attached to the hidden side of belly panels.
4) The exhaust pipe itself wrapped in fiberglass racing wrap.
5) The lower A-arms of the rear suspension may be able to carry their own belly panels.
6) Everything which doesn't 'move' can have a frame structure attached below, from which the skins are secured. This will also define the upsweep of the diffuser section.
7) Aluminum, directly under the muffler would be immune to its heat.
--------------------------------------------------------------------------------------
8) A dual mirror delete would be in the neighborhood of delta Cd 0.0125
9) Rear skirts netted Covington Univ. delta-Cd 0.0063 ( 2.1% ), perhaps an okay working number.
10) The rear belly section with slow diffuser (2.8-degree) was delta-Cd 0.02 ( Audi & FIAT ) if memory serves me.
If so, we're looking @ an est. Cd 0.2012.
If we were millionaires we could actually know.
whats the cheapest way about going about the rear section? im doing this to save money in the long run

kind of bummed that wheel skirts have a smaller impact than simple side mirrors
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Old 04-22-2022, 01:51 AM   #186 (permalink)
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Trailer hitch receiver mounted box.
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Old 04-22-2022, 11:45 AM   #187 (permalink)
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Trailer hitch receiver mounted box.
That sounds like the route I may have to go for long road trips. Idk how id get around the license plate and brake light thing with that?

And I meant cheapest with building a proper rear undertray and diffuser

Im heading to the Oregon coast this weekend and have a friend with a shop and can lift the car up so Ill try and get really good under body pictures and Ill probably smooth out the existing front splash pad with some flex seal or something while its up in the air
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Old 04-22-2022, 12:56 PM   #188 (permalink)
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Trailer tail light wiring socket

I'm hoarding a pair of Nissan Pulsar NX tail lights for just such a situation.


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Old 04-24-2022, 07:45 PM   #189 (permalink)
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Is there an easy way to mount rear wheel skirts into the existing bolts and trim clips in the wheel well? I’d weld some brackets angled about 90 degrees in a few spots around the wheel skirt
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Old 04-24-2022, 09:23 PM   #190 (permalink)
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ecomodder.com: DIY: plastic rear wheel skirts (Geo Metro)

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